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Writing a "Hello, World!" program.

Objective

Write a program which prints "Hello, World!" on the screen.

Structure

Let's create a folder called 'code' anywhere on your machine and we will put all our Go code in it. Inside the 'code' folder lets create one more folder for basic tutorials

code/basic/

For our first program create a new folder '01_hello_world'

code/basic/01_hello_world

And lets create a file 'hello_world.go' in it, finally the structure would look like this:

code/basic/01_hello_world/hello_world.go

Code

Write the code as shown below, while you can simply copy and paste, its better if you write everything on your own.

Don't worry if you code won't work, only then copy and paste the code 😄

Hello World
1 package main
2
3 import "fmt"
4
5 func main() {
6   fmt.Println("Hello, World!")
7 }

Running your code

Open your terminal and navigate to our folder

code/01_hello_world/hello_world.go

Once in the folder type the following command

go run hello_world.go

Build

Instead of just running let's try to build our code by compiling it to binary.

Instead of "go run" type the following command

go build hello_world.go

If you are running on a unix based system including mac OSx, you can run the binary by typing

./hello_world

Output

If there are no errors, you should get the output as:

Output
Hello, World!

If for some reason your code isn't working, checkout the golang playground or github links in the following section.

Github

Github Repo

That's it, Congratulations ! You just wrote your first Go program.

Golang Playground

Golang has a online sandbox environment for running your Go programs, which can be accessed on Golang Playground

I will be posting all the playground links for all the code we write, this way you can run them online and compare with your code.

Hello World On Playground

Click on the below link:

Hello World

Next

If you haven't understood anything what you wrote, no worries, you aren't expected to understand it just yet !

In the next section we will understand everything line-by-line.

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